Mineral Properties - Guadalupe (Details) - Guadalupe De Los Reyes, Mexico - Option Agreement Two - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2017	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Aggregate Payments Received To Date Of Sale Price Of Gold Project		$ 4,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-31 | Before Four Year Anniversary
Property, Plant and Equipment [Line Items]
Sale price of gold/silver project	$ 1,500